Yes, there are several forums - LawnSite.com, PlowSite.com, LandscapeConstructionSite.com, and SuperintendentSite.com as well as EverythingGreen.com.

I was the former owner of all of these sites and they were acquired by Moose River Media in October of 2006. I still manage and grow the sites and I am part of Moose River Media.

Moose River Media has quite a few magazines for the industry as well - all the magazines are free so if you haven't signed up, you can look at the bottom of the site for links directly to the sites where you can sign up for free subscriptions.